Abstract

Transparent copper nanorod/nanowire arrays and anodic alumina oxide composite films have been prepared by alternating current electrodeposition, and their linear optical properties have been systematically characterized by absorption spectra. In the experimental spectra, there exist transverse and longitudinal resonance peaks, which are caused by the surface-plasmon resonance along the diameter and the length of the coppernanorods, respectively. The transverse resonance peak is affected by the diameter and aspect ratio of the nanorod. The longitudinal resonance peak appears at longer wavelength when a polarized light illuminates the film with an angle of incidence of about 70°, where the angle is defined with respect to the surface normal. Moreover, the longitudinal resonance mode is sensitive to the polarization direction when compared with the transverse resonance mode.

Received 14 April 2005Accepted 13 July 2005Published online 08 September 2005

Acknowledgments:

This work was supported by the Ministry of Sciences and Technology of China through the 863 project under Grant No. 2003AA32G030 and the 973 project under Grant Nos. 2002CB61306 and 2001CB6104 and National Science Foundation of China under Grant Nos. 50425204, 5027203, and 90401012.